Container



May 13, 1952 w, A, EATON 2,596,225

. CONTAINER Filed May 23, 1946 '4 Sheets-Sheet 1 a Gt'torrzegs y .3 1952 7 w. A. EATON 2,596,225

- CONTAINER I Filed May 25, 1946 4 sheets-sheet 2 attorneys May-13, 1952 w. A. EATON 2,596,225 CONTAINER Filed May 23, 1946 4 Sheets-Sheet 3 WigredAEabozu.

a florrzeys May 13, 1952 I w, EATON 2,596,225

r CONTAINER Filed May 23, 1946 '4 Sheets-Sheet 4 Tnzvemtor WlfredA Edible at tormegs Patented May 13, 1952 UNITED STATES ATENT OFFICE CONTAINER Illinois Application May 23, 1946, Serial No. 671,832

29 Claims. 1

This. invention relates to containers of paperboard. or other sheet. material, and more particularly to a novel liquid-tight and. slit-proof container and to; a. means and method for makin the same.

One of the objects of the present invention is to provide a novel paper container blank which is readily adapted for quick. and efficient sealing at both ends, the construction being such that complete sealing of all pin. holes, and cracks is achieved, thus providing a container having end portions which. are completely liquid-tighhwhen used for liquids, or sift-proof when employed for powdered materials.

Another object isto provide a closure for the upper end of a tubular container, so constituted as to. permit portions of the container blank forming the end closure to be adhesively bonded together under a relatively high pressure, sufiicient to efiecta positive flow of adhesive between the portions to fill and seal all cracks and openingstherebetween at the container end.

A further objectof the invention is to provide a novel closure for the upper end of a container of the above type, so formed as to provide the user with. a convenient means for gripping and carrying the container.

Still another object of the invention is to provide a liquid-tight and sift-proof container wherein the entire container and both. end clo sures are. formed of asingle piece of sheet material such as paperboard.

Yet. another object is to provide a one-piece container blank scored to permit folding in such a manner as tov permit efficient and positive sealing of both ends under a. relatively high pressure.

A further; object is to provide a container blank. adapted to be folded in such a manner as to. provide flange portions at the end of the container. walls connected by continuous webs of the container material and an end closing iiap integral with one, of, the flange. portions adapted to. be bonded. to the flange portions under relatively high pressure in order to effect a how of adhesive between the flap and flange portions to closev all openings therebetween.

Another object of the invention is to provide novel means for forming the end of a container of the above type and for applying pressure to seal the container end.

Still another object of the. invention is to provide means for forming and securely sealing an end closure on a container of the. above type after the latter has been filled with liquid or other material, in order to provide a leak-proof container.

Yet another object of the invention is to provide a novel means and method for forming a leak-proof end closure on a container of the above type by adhesively joining. portions of the container material under relatively high. pressure.

A further object of the invention is to provide a novel means and method for forming a leakprocf container of the above type having a substantially flat top, in order to permit stacking of the filled container.

Still another object of the invention is. to. provide a substantially flat leaksproof end closure for a rectangular container of the above type, the width of which is less. than that of the body portion, of the container along one dimension, in order to facilitate handling of the containers during packing of the filled containers in a carton and subsequent removal of the containers therefrom.

Yet another object of the invention is to provide a container blank foldable to form a. leakproof end closure of relatively great strength and rigidity.

Another object is to provide, a novel leakeproof container of triangular cross section having a substantially fiat top capable of being sealed under relatively high, pressure after the. container is filled.

A further object of the invention. is to provide a leak-proof polygonal container of paperboard or other sheet material formed from piece of said material.

Still another object of the invention is to provide a novel one-piece container blank adapted to be formed into a polygonal leak-proof container.

Other objects and novel features of thei'nventicn will appear more fully hereinafter from. the following detailed description when considered in connection with the accompanying drawings, wherein several embodiments of the. invention are illustrated. It is to be expressly understood, however, that the drawings. are utilized for purposes ofillustration only, and are not to be, taken as a definition of the limits of the invention, reference being had forjthispurpose to the appended claims.

In the drawings, wherein similar reference characters refer to similar parts throughout the several views:

Fig. 1 is a perspective view of a blank adapted to be formed intoa container of the above type;

a single Fig. 2 is a perspective view of a partially assembled container and mechanism for forming the container;

Fig. 3 is a perspective view showing a step in the formation of the end closure and mechanism for forming the end closure;

Fig. 4 is a perspective view showing another step in the formation of the end closure and mechanism for forming the end closure;

Fig. 5 is a perspective view showing a further step in the formation of the end closure and mechanism for forming the end closure;

Fig. 6 is a perspective view of a container blank showing a modification of the invention;

Fig. 7 is a perspective view of a completed container;

Fig. 8 is a perspective view of a, blank adapted to be formed into a container having a triangular cross section, and

Fig. 9 is a perspective view of a completed container formed from the blank shown in Fig. 8.

The present invention is particularly directed to a means and method for forming and sealing the upper end of a paperboard or similar contamer of sheet material by means of flanged portions formed at the upper ends of the contamer walls and foldable overlapping end flaps adhesively bonded thereto, the bottom end of the container being preferably closed and, sealed as set forth more fully in the copending application of Roy S. Saniord and Wilfred A. Eaton, Serial No. 644,547, filed January 31, 1946, for Paper Container, owned by the same assignee as the present application. It is to be understood, however, that in certain instances both ends of the container may be formed and sealed in accordance with the present invention. In either case, a leak-proof container is formed which is substantially nat at the top and bottom and which permits the containers to be placed one on top of the other in order to conserve storage space. The present construction permits the nange portions at the top of the container to be sealed under relatively high pressure, and since a coating of flowable adhesive is applied to the flange portions or flaps, or to both, the application of pressure is effective to positively flow the adhesive between the flange portions and flaps in order to fill and seal all openings therebetween.

The present construction provides flange portions at the end of each of the container walls which are connected by continuous webs of the material of which the container is formed, a feature which greatly facilitates the formation of a leak-proof end closure. As will be more fully pointed out hereinafter, portions of the container walls are folded inwardly to form supporting panels for the flange portions, and continuous webs of material connecting the supporting panels are folded to form supporting ribs of great strength, the, result being an end closure having extreme rigidity. At the same time, the construction of the container end provides convenient recesses and flanges which may be readily grasped by the user to facilitate lifting and handling of the container. To further aid in the handling and packing of the containers in shipping cartons, a novel feature of the invention provides for making the width of the container top in one direction slightly less than the width of the body portion of the container in a corresponding direction. Thus when a number of the containers are packed in a carton, for example, the edges of the container tops are spaced from each other,

making it easier to grasp the containers to remove them from the carton.

Referring more particularly to Fig. 1, the present invention is illustrated therein as including a container blank a divided by scored folding lines 5 into rectangular wall panels 6, I, 8, and 9, the panel 6 being provided with a glue flap I6 adapted to be adhesively secured to the panel 9, which is provided with a coating of adhesive II along the right edge thereof for this purpose. As

set forth in the copending application above referred to, the wall panels 6 and 8 are provided at their lower ends with integral half-flaps I2 and I3, while the panels I and 9 are provided with full-flaps I4 and I5, the flaps I2, I3 and I4, is thus being in opposed relationship when the container is assembled. Flaps I2 and I3 are provided with scored lines I6 and I! which divide the flaps respectively into separate panels IB and I9 and 2t and 2i of the same shape and of substantially equal area, the inner surfaces of these flaps being provided with flowable adhesive coatings 22. The inner surface of flap I4 is provided with a similar adhesive coating 23, while flap I5 is provided with narrow strips of adhesive coating I 2% and 25. The blank is formed into a tube by joining the flap It? to the wall panel 9, and thereafter the bottom closure is formed by folding the panels I8 and I9 and go and 2| with their adhesively coated surfaces together and folding the resulting flaps of double thickness bodily inwardly substantially at right angles to the corresponding container walls. The flaps I5 and I4 ar thereafter folded inwardly in the order named, and all of the flaps are subjected to pressure to effect a bond therebetween and to positively flow the adhesive coatings thereon into all cracks and pin holes between the naps and between the flaps and container walls, thus forming a leak-proof substantially flat closure for the bottom of the container, as more fully set forth in the above referred to copending application.

Referring to the upper portion of the blank of Fig. l, a horizontal score line 25 defines, in cooperation with angularly disposed score lines 27, 2s, 29 and 30, substantially isosceles trapezoidal shaped panels 38 and 32 at the upper ends of wall panels t and 8, and adjacent substantially triangular panels 33, 34, 35 and 36. Additional horizontal score lines 3'! and 38 define, in con unction with the score line 26 and the vertical score lines 5, rectangular panels 39 and 40 at the upper ends of wallpanels I and 9 respectively. Other angularly disposed score lines 4|, t2, and 43, 44 on panels 6 and 8 respectively, together with score lines 5 and 26, define a pair of triangular panels 45 and it on wall panel 6 and a pair of triangular panels 47 and 48 at the upper end of wall panel 8. If desired, an additional horizontal score line at may be provided, which defines, in conjunction with score lines 25, 51, d2, 43 and i i, isosceles trapezoidal shaped panels 56 and 5! at the upper ends of wall panels 6 and 8 respectively. In the present instance, end closing flaps 52 and 53 are provided and formed integrally with rectangular panels 39 and 43 respectively, these flaps being provided with adesive coatings 5t and 55 as shown. The panels 33, GI, 34, 39, 35, 32, 36 and ii} are likewise provided with a continuous coating of fiowable adhesive 56 which is continued along the upper end of the glue fiap Ill, but it should be understood that if desired, the adhesive coating may be limited to the above named panels only, or to the end'fiaps 52 and 53.

porting panels, on folding of the flange forming panels into horizontal position, will, in this instance be substantially horizontal, or coincident with the flange forming panels, thus increasing the difliculty of substantially effecting engagement between the inner surfaces of triangular panels 45, M5, 57 and 63 with the inner surfaces of the adjacent flange supporting panels, while at the same time this latter arrangement would also increase the difficulty of effecting full and complete support of the flange forming panels by the inner ends of the slides 53, 6|, 52, and 63 in the manner heretofore stated, during forming and sealing of the end closure of the container. In this way, as shown in Fig. '7, ribs 59 are formed which serve to stiffen and rigidly support the flange forming portions at the upper end of the container, and also provide opposed recesses 16 which permit the user to readily grasp and handle the container. Although the score line 49 is utilized in the preferred form of the container, it has been found that the end closure may be satisfactorily formed when this score line is omitted, and that the appearance of the container is not materially altered when this procedure is followed. It should also be noted that during the pressure step, the adhesively coated surfaces of the substantially triangular panels engage the adhesively coated surfaces of the adjacent rectangular flange forming panels and are bonded thereto to form a strong reinforcement at the corners of the end closure.

Another important feature of the invention resides in the provision of means for making the dimension A in Fig. 7 less than the width of the wall panels 6 and 8, in order to provide clearance between the top edges of the containers when packed in a carton, thus permitting the user to readily grasp and remove the containers therefrom. To this end, the rectangular panels 39 and 43 are made narrower than the panels 3| and 32, as shown, and the end closing flaps 52 and 53 are shortened correspondingly. As will be explained more fully hereinafter, the use of flange forming panels of the same width can result in the formation of a top having substantially the same shape and area as the cross sectlon of the container, dependent on the arrangement of the diagonal score lines. As shown more fully in Fig. 6, the angularly disposed score lines 21, 28, 29 and 33, which in a rectangular container preferably make a 45 angle with the score line 25, will intersect the vertical score lines at the upper edges of the flange forming panels and at the junction of the score lines 31 and 33 with the vertical score lines thus forming panels of true triangular shape. It has been found, as indicated on the drawings, that in order to fold the flange forming panels to form a flat flange horizontally disposed with respect to the vertical axis of the container, the score lines 21, 28, 29 and 33 should be at 45 to the horizontal score line 26 in a rectangular container, in order to permit folding of the panels without rupturing the material of which the container is constructed, while the angles between the vertical score lines 5 and the angular score lines 4|, 42, G3 and ti l should preferably be less than 45 in order to facilitate the formation of the flange supporting ribs and flange supporting panels as shown, and referring again to Fig. l, it-will be understood that in the event the score lines 21, 28, 29 and 38 shown in that figure were positioned to intersect the vertical score lines 5 to form panels oi true triangular shape, the angle between the angularly disposed score lines and the horizontal score line 26 would be less than 45, and the material would either rupture or stretch unduly on operation of the forming machine to fold the flange forming panels into a horizontal position. To overcome this difficulty a small substantially rectangular portion is cut out at each upper corner of panels 3| and 32 as shown, Fig. l, and the 'score lines 21, 28, 29 and 30 are positioned at an angle of 45 to the score line 26. When the panels are folded to form the end closure the dimension 1 A in Fig. 7 is substantially the same as the distance between the upper ends of score lines 21 and 28 and 29 and 30, and since this distance is less than the width of wall panel 6, the length A is likewise less than that of wall panel 6. At the same time, the width of the panels 3| and 32 is such as to allow their edges to substantially coincide with the sides of the end flaps 52 and 53 when the latter are bonded to the panels 3| and 32 thus providing a large bonding surface which materially strengthens the top of the container and at the same time improves the appearance. Thus, a container is formed having a flat flange at the upper end adapted to receive a closure member adhesively secured thereto, the flange, as illustrated, being supported by downwardly extending ribs and flange supporting panels integral with the flange forming panels and integral with the corresponding main wall portions of the container at their lower ends. It is also observed that, in the event the angular relation of the lower apices of the lower triangular panels 45, 46, 41 and 48 above referred to is adhered to, suflicient space is afforded beneath the flange forming panels 3|, 39, 32 and 4!) to accommodate the ends of the slides 63, 6|, 62 and 63 in such a manner as to effect substantially complete support of the flange forming panels during the sealing operation.

It will be clear from the above that the panels 33, 34, 35 and 36 are substantially in the form of right isosceles triangles having their upper corners cut out, such corners being included in the aforesaid cut out rectangular portions.

A modified container blank is illustrated in Fig. 6, the upper portion of the container being provided with score lines 23, 21, 23, 29, 33, 31, 38, 4|, 32, 43 and 43 as shown, defining true triangular shaped panels 33, 34, 35 and 36, true isosceles trapezoidal shaped panels 3|, 32, 56 and 5!, and rectangular panels 39 and 40 having the same width as panels 3| and 32, and triangular panels 45, 45, 41 and 48. In this form however, end closing flaps H and 12 are formed integrally with flange forming trapezoidal panels 3| and 32, and on folding of the upper panels of the container after sealing of the side seam and the lower end has been completed, the flaps H and 12, which are provided with adhesive coatings l3 and T4, are folded inwardly in overlapping'relationship with flange forming panels 3|, 39, 32 and 59, and subjected to pressure in the manner already described to effect a bond therebetween and to flow the adhesive to fill and seal all cracks and pin holes therebetween. In like manner it is contemplated that a single flap may be used integral with any one of the flange forming panels, or that a separate end closing flap or member of paperboard or any other suitable material may be adhesively secured to the flange forming panels in the manner described herein.

In the modified construction above described, it will be seenthat the panels 3|, 39, 32 and 40 all have the same width, the panels 3| and 32 having a true isosceles trapezoidal shape, and the panels 33, 34, 35 and 36 having a true triangular shape. Thus on forming of the top end closure, a substantially flat top is formed having approximately the same shape and area as the cross section of the container.

Although the invention has been described as being practiced with a flowable adhesive, it is contemplated that such adhesive may be of the flowable thermo-plastic type, in which event means may be provided for applying heat to the end closing flaps and flange forming panels during the pressure step, as well as means for cooling the panels and flaps thereafter to insure setting of the adhesive after flowing and sealing.

A further modification of the invention is shown in Figs. 8 and 9, Fig. 9 showing a finished container 74a of triangular cross section. Referring to Fig. 8, a blank for such a container includes three wall panels l5, l6 and H, and an adhesively coated glue flap 18, which serves to connect wall panels 15 and 1'! when the blank is folded to form a container, the blank being provided with folding or scored lines 19 to facilitate this operation. The lower ends of panels it and T! are provided with foldable triangular end closing flap-s 80 and 81 of substantially the same area and shape as the cross section of the container, while panel 15 is provided at its lower end with a similar triangular end flap 82 and a triangular end flap 83 integral therewith and having the same shape and area.

The bottom closure of the container is formed is accordance with principles set forth in the above referred to application of Sanford and Eaton, the end flaps all being provided with a coating of flowable adhesive on their inner surfaces, and the closure being formed by folding flaps 82 and &3 together about a score line '85 with their adhesively coated surfaces together, folding the resulting triangular flap of double thickness inwardly, folding flaps 8H and 8! inwardly in superposed relation with the double flap 82-83, and subjecting the flaps to pressure to flow the adhesive outwardly toward the walls and corners of the container to seal any openings therein and to bond the flaps together. The double flap 82-83 is preferably positioned with the edges thereof substantially within the container and thus the adhesive which is forced outward between these flaps during the pressure step is confined within the container to insure an effective seal.

At the upper end of the blank, the score lines 79 define, in connection with score lines t, fill and 88, outwardly folding flange forming panels 539, triangular webs 9% connecting said panels, inwardly folding flange supporting panels 5!, and triangular webs 92 connecting the supporting panels. Triangular end closing flaps 93, illustrated as being formed integrally with the upper ends of the side wall panels 15, iii and Ti, are adapted to be folded inwardly about score line 94. The panels 8.9 are provided with a flowable adhesive coating 95, and the edge portions of the flaps 93 are provided with flowable adhesive coatings 96.

In the present modification, there is only one triangular web adjacent each flange supporting panel, and one triangular web adjacent each flange forming panel, these being arranged symmetrically as shown. During forming of the upper end closure, panels iii and 92 are all folded inwardly and panels 89 and 98 are all folded outwardly, the panels 89 forming a substantially continuous flange about the upper end of the container. At the same time, the triangular webs are all folded in the same direction with respect to the adjacent panels, resulting in a symmetrical arrangement of the supporting panels which is particularly adapted to facilitate the formation of a flanged ,end closure on the end of any tubular container having an uneven number of sides.

This forming or folding ofthe panels is preferably performed on a machine of the type illustrated in Fig. 2, the machine in this instance being provided with three relatively movable members or slides instead of four. The flange forming panels, after folding, are supported by the slidable members, and the closure is completed by folding the flaps 93 inwardly in overlapping relationship and squeezing these flaps and the flange forming panels together to eifect an adhesive bond therebetween and to positively flow the adhesive to seal all openings between the end flaps and flanges. The completed container is illustrated in Fig. 9, and it will be understood that the provision of single connecting webs at one end only of each of the foldable flange forming and flange supporting panels results in a construction adapted to the formation of a flanged end closure on a triangular container or on any container having an uneven number of side walls. Thus connected flanges can be formed along each side of the container end, and an end closing panel or panels can be pressed against the flange with any desired force order to effect a seal therebetween.

While several modifications have been illustrated and described herein with considerable particularity, it will be understood by those skilled inthe art, that various changes and modifications may be resorted to without departing from the spirit of the invention. Reference will, therefore, be had to the appended claims for a definition of the limits of the invention.

What is claimed is:

l. The method of forming a substantially flat end closure for a polygonal tubular container of sheet material having an even number of side walls, which comprises scoring and cutting the material to provide at least one foldable end closing flap integral with one of the side walls and to define side walls divided into lower and upper panels, scoring the upper portions of said lower panels on alternate side walls to define a pair of triangular lower panels thereon, scoring the upper panels on said alternate side walls to define a substantially isosceles trapezoidal panel and a pair of upper substantially triangular panels, coating all of said upper panels with adhesive, folding said triangular lower panels and the upper portions of all of the lower side wall panels inwardly with respect to said container walls and substantially simultaneously folding all said upper panels outwardly substantially into planes at right angles to the vertical axis of the tubular container, folding said end flap inwardly with its inner surface in engagement with the inner surfaces of said trapezoidal on said alter- .nate side walls and with said upper panels on the other of said side walls, and pressing said flap said trapezoidal panels and said last named upper panels to effect a bond between said and panels and to flow said adhesive to fill all openings between said upper panels and flap.

'2. A blank of sheet material adapted to be formed into a tubular polygonal container having a substantially fiat closure at one end, said blank comprising a sheet of said material divided by scored lines into a plurality of side wall forming panels foldable into tubular form having four side walls, scored lines on the upper portions of two alternate side wall panels defining upper and lower rectangular panels, scored lines on the corresponding upper portions of the other two side wall panels defining upper and lower panels shaped substantially as isosceles trapezoids having the shorter of their parallel sides coinciding and also defining triangular panels connecting the non-parallel sides of said trapezoidal shaped panels on one of said other two side walls with the adjacent side walls and connecting the nonparallel sides of said trapezoidal shaped panels on the other of said other two side walls with the adjacent side walls, and at least one foldable end closing flap integral with one of said upper rectangular panels.

3. The method of forming a tubular ploygonal container having four side walls and a substantially flat closed end, which comprises cutting and scoring a blank of sheet material to define a plurality of side wall panels and at least one foldable end flap coextensive with one of the side wall panels, scoring said blank to define upper and lower substantially triangular panels adjacent either edge of two alternate wall panels having common bases and each having sides coinciding with the edges of said alternate wall panels, coating the upper portions of said wall panels on one surface, including said upper triangular panels, with adhesive, adhesively joining a pair of the wall panels and folding said panels to form a four-sided tubular container, substantially simultaneously folding said lower triangular panels and the adjacent portions of all the side wall panels inwardly and the upper triangular panels and the adjacent portions of the wall panels outwardly to form an outwardly directed adhesively coated flange at the container end, folding said end flap inwardly, and pressing said flap and adhesively coated flange together to effect a bond therebetween.

4. The method of forming an end closure on the end of a tubular container having four side walls, which comprises coating the inner surfaces of the upper portions of said side walls with an adhesive, folding said upper portions of two opposed side walls and adjacent lower portions of said two side walls respectively outwardly and inwardly to form outwardly extending flange portions at the ends of said two walls, substantially simultaneously folding upper and lower centrally positioned portions of the other two side Walls and adjacent upper and lower substantially triangular portions adjacent the edges of the other two side walls respectively outwardly and inwardly to form outwardly extending flange portions connected with the first named flange portions by the upper of said triangular portions, positioning an end closing flap against said flanged portions, and pressing said flanged portions and flap together to effect an adhesive bond therebetween.

5. The method of forming an end closure on the end of a tubular container of sheet material having four side walls and foldable end closing flaps coextensive with at least two of said side walls at said container end, which comprises applying a flowable adhesive coating on the inner surfaces of said end flaps, folding the end portions of two opposed side walls and the adjacent portions of said two opposed side walls respectively outwardly and inwardly to form outwardly extending flange portions at the ends thereof, substantially simultaneously folding centrally positioned end portions and adjacent portions of the other two side walls and substantially triangular end and other portions adjacent said centrally positioned portions respectively outwardly and inwardly to form outwardly extending flange portions connected with the'first named flange portions by said triangular end portions, folding said end flaps inwardly in overlapping relationship with one of said flaps substantially in engagement, with said flange portions, and pressing said flaps and flange portions together to effect a bond therebetween and to flow said adhesive to seal all openings therebetween.

6. A container blank of sheet material for a tubular container having a substantially fiat end closure, said blank comprising a sheet of material having a plurality of side wall panels, said sheet being foldable into a tubular form having four side walls and end closing flaps coextensive with at least two of said side walls, score lines on two alternate side walls defining a rectangular panel at the end of each of said two alternate side walls and defining adjacent rectangular panels, both of the same width as the corresponding side walls, and score lines on the other two side walls defining, when the blank is folded into tubular form, a substantially isosceles trapezoidal shaped portion at the end of each of said other walls, adjacent isosceles trapezoidal shaped portions I having the shorter of the parallel sides thereof coinciding with the shorter of the parallel sides of the first named trapezoidal shaped portions, and a pair of substantially triangular portions on either side of each of said trapezoidal portions having common base lines, having sides coinciding with the non-parallel sides of said trapezoidal portions, and having the other sides coinciding with the sides of said other walls.

7. A flat blank for a tubular container of triangular cross section having a substantially flat end closure at one end, said blank comprising a sheet of material having sidewall panels, score lines on the side wall panels adjacent said one end defining foldable end flange forming panels, substantially triangular foldable panels connecting said flange forming panels, foldable side wall 7 portions adjacent each of said flange forming panels, triangular panels connecting said foldable side wall portions, and at least one foldable end closing fiap coextensive with one of said flange forming panels.

8. A leak-proof tubular container of sheet material having a plurality of side walls, a sealed bottom closure, and a flanged closure at the other end including outwardly folded flange forming panels at the upper ends of said side walls, substantially triangular outwardly folded panels connecting said flange forming panels, inwardly folded flange supporting side wall portions below and joining said flange forming panels, inwardly folded triangular panels connecting adjacent flange supporting portions, and an end panel adhesively secured to the upper surfaces of said flange forming panels.

9. A leak-proof tubular container of sheet material having a plurality of side walls, a sealed bottom closure, and a flanged closure at the other end including outwardly folded flange forming panels at the upper ends of said side walls, substantially triangular outwardly folded panels connecting said flange forming panels, inwardly folded wall portions adjacent said flange forming" panelsfor supporting the latter, triangue lar inwardly folded panels connecting said inwardly folded wall portions, and an inwardly folded end flap coextensivewith one of saidflange forming panels and adhesively bonded to all of said flange forming panels.

10. A leak-proof tubular four-sided container tangular inwardly folded flange supporting.

panels adjacentsaid flange forming panels, outwardly folded flange forming panels atthe upper ends of the two other side walls, substantially triangular outwardlyfolded panels connecting the second named flange forming panels with the first named flange forming panels, inwardly folded wall portions adjacent said last: named flange forming portions for supporting the latter, inwardly folded triangular panels. connecting said inwardly folded wall portions with said second named rectangular panels, and inwardly folded end closing flaps integral with two of said flange forming panels, one of said last named flaps being adhesively secured to the upper surfaces of all of said flange forming portions and the other of said last named flaps being adhesively secured to said one flap.

11. A leak-proof tubular container having four side walls, a substantially flat bottom closure, and a substantially flat closure for the top end including substantially rectangular outwardly folded adhesively coated flange forming panels at the upper ends of two opposed side walls, substantially rectangular inwardly folded flange supporting panels adjacent said flange forming panels, outwardly folded adhesively coated flange forming panels at the upper ends of the other two side walls, pair of substantially triangular adhesively coated panels on each of said other side walls folded outwardly with said adhesively coated surfaces in engagement with the adhesiveiy coated surfaces of the corresponding first named rectangular panels, said triangular panels connecting the first nained rectangular flange forming panels; with the second named flange forming panels, inwardly folded flange supporting portions on said other two side walls adjacent said second named flange forming panels, inwardly folded triangular panels connecting said flange supporting portions with said second named rectangular panels, and inwardly folded overlapping end closing flaps formed integral with two of said flange forming panels, one of said last named end flaps having an adhesive coating thereon, and said flange forming panels, first named triangular panels and last named end flaps being pressed together with a relatively high pressure to effect adhesive bonds therebetween and to flow said adhesive to seal all openings between said flaps, said; flange forming panels, and said first named triangular panels.

12'. A closed tubular polygonal container having side walls, a bottom closure, and a substantially flat flanged closure for the top end of said container, said flanged closure including outwardly folded panels at the upper ends of the side walls forming a substantially continuous flat flange at the upper end of the container, outwardly folded substantially triangular panels forming unbroken connecting webs between said flange forming panels, inwardly folded side wall portions on each side wall adjacent to and forming a continuous web, between said, side wallsland; flange forming panels-,inwardly folded trian ular panels forming a continuous web between said inwardly folded, wall portions, and, at, least, one end flap formed integral with one of said flange forming panels, and having a shape substantially the same as the cross section of said container, said last named flap being adhesively secured to all of said flange forming panels, and said first named triangular panels being adhesively secured to the inner surfaces of adjacent flange forming panels.

13. An end closure for a tubular paperboard container having four side walls, said closure comprising an outwardly folded panel at one end of each side wall, said panels forming a, substantially flat and continuous flange at said one end, a pair of outwardly folded substantially triangular panels on each of two opposed side walls connecting and forming continuous webs between the flange forming panels on said two sidewalls and the flange forming panels on the other side walls, inwardly folded flange supporting panels on all of said side walls, inwardly folded triangular panels on each of said two side walls connecting and forming continuous webs between the flange supporting panels on said two side walls and the flange supporting panels on the other side walls, and at least one foldable end flap integral with one of said flange forming panels, said flap being adhesively bonded to said flange forming panels.

14'. Mechanism for forming a flat end closure for a four-sided, open-ended tubular container of paperboard material, comprising a pair of rela.

tively movable members movable toward each other for pressing a pair of opposite sides of the container inwardly along lines parallel to but spaced from said open end and across theentire width of said pair of sides to form a pair of inwardly directed panels and to support the container, a second pair of relatively movable members movable toward each other for simultaneously pressing intermediate portions of the other opposite sides inwardly along lines lying in the same plane as the first named lines and for folding portions of said other opposite sides on each side of said intermediate portions inwardly into substantial engagement with the inner surfaces of the adjacent inwardly directed panels and for supporting the container, a retractable member having a cross sectional area substantially equal to that of the container and movable to a posi-- tion within the open end of the container for folding the portions of the container sides between said lines and said. open end outwardly at substantially right angles to the axis of the container to form an outwardly directed and continuous marginal flange at said open end during movement of the members of the respective pairs toward each other, means for thereafter retracting said retractable member, and a plunger operable to adhere an end panel to said flange; of the supported container.

15. A closure for one end of a tubular container of sheet material having a plurality of side walls, said closure comprising an outwardly folded flange forming panel at said one end of each side wall, inwardly folded panels on each side wall for supporting said flange forming panels, outwardly folded panels connecting said flange forming panels and forming continuous webs, therebetween, inwardhp folded panels connecting said supporting panels and forming continuous Webs therebetween, and at least one end flap adhesively secured to said flange forming panels, and said outwardly folded connecting panels being adhesively secured to the inner surfaces of adjacent flange forming panels.

16. Mechanism for forming a flat end closure for a four-sided, open-ended tubular container of paperboard material, comprising a pair of relatively movable members movable toward each other for pressing a pair of opposite sides of the container inwardly along lines parallel to but spaced from said open end and across the entire width of said pair of sides to form a pair of inwardly directed panels and to support the container, a second pair of relatively movable memoers movable toward each other for simultaneously pressing intermediate portions of the other opposite sides inwardly along lines lying in the same plane as the first named lines and to support the container, a retractable member having a cross sectional area substantially equal to that of the container and movable to a position within the open end of the container for folding the portions of the container sides between the first named lines and said open end outwardly at substantially right angles to the axis of the container to form opposite and outwardly directed flanges during movement of the respective members of said first pair toward each other and for folding the corresponding portions of the other sides outwardly at substantially right angles to the axis of the container to form other opposite flanges and folding end portions of each of said corresponding portions outwardly to overlie adjacent end portions of said first named flanges during movement of the respective members of the second pair toward each other, means for thereafter retracting said retractable member, and a plunger operable to adhere an end panel to all of said flanges.

17. Mechanism for forming a flat end closure for a four-sided, open-ended tubular container of paperboard material, comprising a pair of relatively movable members movable toward each other for pressing a pair of opposite sides of the container inwardly along lines parallel to but spaced from said open end and across the entire width of said pair of sides to form a pair of inwardly directed panels and to support the container, a second pair of relatively movable members movable toward each other for simultaneously pressing intermediate portions of the other opposite sides inwardly along lines lying in the same plane as the first named lines and for folding portions of said other opposite sides on each side of said intermediate portions inwardly into substantial engagement with the inner surfaces of the adjacent inwardly directed panels and for supporting the container, a retractable member having a cross sectional area substantially equal to that of the container and movable to a position within the open end of the container for folding the portions of the container sides between the first named lines and said open end outwardly at substantially right angles to the axis of the container to form opposite and outwardly directed flanges during movement of the respective members of said first pair toward each other and for folding the corresponding portions of the other sides outwardly at substantially right angles to the axis of the container to form other opposite flanges and folding end portions of each of said corresponding portions outwardly to overlie adjacent end portions of said first named flanges during movement of the respective mem- 16 bers of the second pair toward each other, means for thereafter retracting said retractable memher, and a plunger. operable to adhere an end panel to all of said flanges.

18. A container of paperboard material having four side walls defining a body of rectangular cross section having a top opening, the upper portions of said walls sloping inwardly to provide two pairs of oppositely disposed, inwardly directed panels, one pair of panels extending across the full width of the respective side walls and the other pair of panels having triangular end portions thereof folded inwardly to substantially engage the inner surfaces of adjacent panels of said one pair to provide strengthening ribs, the top opening being bounded by a continuous outwardly folded flange reinforced at all corners thereof by outwardly folded substantially triangular portions to provide increased thickness at said corners, and an end panel adhesively secured to said flange.

19. A closure for an end of a tubular container having four side walls, said container including upper and lower side wall portions adjacent the upper ends of two opposed side walls having the same width as the corresponding side walls and folded respectively outwardly and inwardly to form substantially flat flanges adjacent the ends of said two side walls, upper and lower portions adjacent said one end of the other side walls folded respectively outwardly and inwardly to form substantially flat flanges adjacent the ends of said other side walls, the last named upper portions and the flanges formed thereby being shorter along their upper ends than the widths of the corresponding side Walls, side wall portions connecting all of said upper portions andconnecting all of said lower portions folded respectively outwardly and inwardly to permit formation of said flanges substantially without rupture of the container material, and an end panel adhesively secured to said flanges.

20. A container blank for a tubular container, said blank comprising a sheet of material having a plurality of side wall forming panels and at least one end closing flap at the end of one of said wall panels, said sheet being foldable into tubular form having four side walls, and score lines on portions of said walls adjacent said one end defining foldable flange forming portions, the longest dimensions of the flange forming portions on two alternate walls being less than the widths of the corresponding walls, defining adjacent foldable portions, defining substantially triangular foldable panels connecting said flange forming portions, and also defining triangular foldable panels connecting said adjacent foldable portions.

21. The method of forming a flat end closure for a four-sided, open-ended tubular container of paperboard material, which comprises pressing a pair of opposite sides of the container inwardly along lines parallel to but spaced from said open end and across the entire width of said pair of sides to form a pair of inwardly directed panels, simultaneously pressing intermediate portions of the other opposite sides inwardly along lines lying in the same plane as the first named lines and folding portions of said other opposite sideson each side of said intermediate portions inwardly into substantial engagement with the inner surfaces of the adjacent inwardly directed panels, substantially simultaneously folding the portions of the container sides between said lines and said open end outwardly at substantially right 17 angles to the axis of the container to form an outwardly directed and continuous marginal flange at said open end while supporting the, container beneath the last named portions, and finally adhesively securing an endpanel to said flange.

22. The method of forming a flat end closure for a four-sided, open-ended tubular contain r of paperboard material, which comprises pre g: a pair of opposite sides of the container inwardly along lines parallel to but spaced from saidppen end and across the entire width of saidpair of sides to form a pair of inwardly directed panels, simultaneously pressing intermediate portions of the other opposite sides inwardly along lines, lying in the same plane as the first named lines,.substantially simultaneously folding the portions of the container sides on the first sides betweenthe first named lines and said open end outwardly at substantially right angles to the axis of the container to form opposite and outwardly directed flanges while supporting the container beneath said flanges, substantially simultaneously folding the corresponding portions of the other sides outwardly at substantially right angles to the axis of the container to form other opposite flanges and folding end portions of each of said corresponding portions outwardly to overlie adjacent end portions of said first named flanges while supporting the container beneath said other flanges, and finally adhesively securing an end panel to all of said flanges.

23. The method of forming a flat end closure for a four-sided, open-ended tubular container of paperboard material, which comprises pressing a pair of opposite sides of the container inwardly along lines parallel to but spaced from said open end and across the entire width of said pair of sides to form a pair of inwardly directed panels, simultaneously pressing intermediate portions of the other opposite sides inwardly along lines lying in the same plane as the first named lines and folding portions of said other opposite sides on each side of said intermediate portions inwardly into substantial engagement with the inner surfaces of the adjacent inwardly directed panels, substantially simultaneously folding the portions of the container sides on the first sides between the first named lines and said open end outwardly at substantially right angles to the axis of the container to form opposite and outwardly directed flanges while supporting the container buneath said flanges, substantially simultaneously folding the corresponding portions of the other sides outwardly at substantially right angles to the axis of the container to form other opposite flanges and folding end portions of each of said corresponding portions outwardly to overlie adjacent end portions of said first named flanges while supporting the container beneath said other flanges, and finally adhesively securing an end panel to all of said flanges.

24. A container blank for a tubular container of rectangular cross section having a substantially flat flange at one end adapted to receive an end closure, said blank comprising a sheet of material having side wall forming panels, said sheet being foldable into a tubular form having four side walls, and score lines on portions of said side walls adjacent said one end of said container blank defining, when the blank is folded into tubular form foldable flange forming panels, adjacent foldable portions, substantially triangular foldable panels connecting adjacent flange forming panels, and triangular foldable 18 panels connecting adjacent foldable portions, the angle at the lower apices of the last named triangular foldabel panels being less than the angle at the upper apices of the first named triangular foldable panels.

25. A leakproof tubular container of sheet material having a plurality of side walls, a sealed bottorn closure, and a flat flanged closure at the other end including outwardly folded flange forming panels at the upper end of said side walls, substantially triangular outwardly folded panels connecting said flange forming panels, inwardly folded flange supporting side wall portions below and joining said flange forming panels and extending downwardly therefrom towards the corresponding main side wall panels of said container. inwardly folded panels connecting adjacent flange supporting portions and forming ribs extending downwardly from said flange forming panels, and an end panel adhesively secured to the upper surfaces of said flange forming, panels.

26, A leakproof tubular container of sheet material of rectangular cross section, having side walls, a sealed bottom closure, and a flanged closure at the other end including outwardly foldedflange forming panels at the upper end of said side walls forming a substantially fiat flange horizontally disposed with respect to the vertical axis of the container, substantially triangular outwardly folded panels connecting said flange forming panels, inwardly folded flange supporting side Wall portions below and joining said flange forming panels and extending downwardly therefrom in suporting relationship, inwardly folded triangular panels connecting adjacent flange supporting portions and forming ribs of double thickness extending downwardly from said flange forming panels and merging with the main wall panels of the container at their lower ends, and an end closing panel adhesively secured to the upper surfaces of said flange forming panels and forming a flat closure for the upper end of said container.

27. A container blank of sheet material for a tubular container having a substantially flat end closure, said blank comprising a sheet of material having a plurality of side wall forming panels, said sheet being foldable into a tubular form having four side walls, score lines on two alternate side walls defining a rectangular panel at the end of each of said two alternate side walls and defining adjacent rectangular panels, both of the same width as the corresponding side walls, and score lines on the other two side walls defining when the blank is folded into tubular form, substantially isosceles trapezoidal shaped portions at the ends of said side walls, adjacent isosceles trapezoidal shaped portions having the shorter of the parallel sides thereof coinciding with the shorter of the parallel sides of the first named trapezoidal shaped portions, and a pair of right triangular portions on either side of each of the trapezoidal portions having common base lines, having sides coinciding with the non-parallel sides of said trapezoidal portions, and having the other sides coinciding with the sides of said other Walls, the upper triangular portions being substantially in the form of right isosceles triangles, and the other triangular portions being in the form of right triangles having angles at their lower apices of less than 45.

28. A tubular container having a body of rectangular cross section formed of foldable sheet material and having a flat end closure at one end substantially triangular panels connecting the ends of said flange forming panels and forming reinforced portions of increased thickness at the corners of said flange, other folded panels connecting the flange forming panels and said triangular panels with said container body and all of said panels being formed integrally with the bodyof said container, and a flap integral with said container body adhesively secured to said flange forming'panels.

29. An end closure for a tubular container of polygonal cross section having side walls, said end closure including inwardly folded panels integral with the corresponding side walls, adjacent outwardly folded flange forming panels integral with the inwardly folded panels and forming a substantially continuous flange about the end of the container, said inwardly and outwardly folded panels respectively being interconnected by other folded panels integral therewith and including substantially triangular panels forming reinforced portions of increased thickness at the corners of said flange, and an end closure member secured to said flange in sealing relationship to close the end of said container.

' WILFRED A. EATON.

REFERENCES CITED The following references are of record in, the flle of this patent: V

UNITED STATES PATENTS Number Name Date 663,133 Shipley, Jr Dec. 4, 1900 1,147,652 Scudder July 20, 1915 1,934,756 Smith Nov. 14, 1933 1,987,647 Wellman Jan. 15, 1935 2,027,488 Ness Jan. 14, 1936 2,085,478 Scott June 29, 1937 2,085,979 Hothersall Julyfi, 1937 2,104,727 Balsam et al Jan. 11, 1938 2,238,388 Hartmann Apr. 15, 1941 2,245,193 Hartman June 10, 1941 2,263,545 Waldvogel Nov. 18, 1941 2,296,664 Hall Sept. 22,- 1942 2,338,019 Baker et al Dec. 28,1943 2,398,404 Brooks Apr. 16, 1946 FOREIGN PATENTS Number Country Date 331,062 Italy Oct. 29, 1935 

